By clicking 'edit' within the Grid area you will be brought into an area to review and adjust the 'criteria' placed on the report results. 

• Clicking + Add Filter Item will provide a fresh row that you can select a field and the associated options to change the returned data.
• Refresh will update the count of results based on changes you've made.
• Garbage Icon will delete the row of criteria you've applied.
• Save/Save As will commit your changes to the existing filter, or allow you to create a new filter.